Exhaust louder without tune?

wonsungnabi · 09-13-2010, 04:01 PM

I have BMW PE. I set it to stock map before service and the exhaust was noticeably louder at low rpm. Can anyone explain this please?

NiVeDh · 09-13-2010, 05:50 PM

Something to do with tunes and how they go about controlling the wastegates.

scrufy · 09-13-2010, 06:01 PM

I'll have to try this one out- I have the PE exhaust too. I'll set it to map zero on my jb3 after work. interesting.

new2the3 · 09-13-2010, 07:29 PM

I could be completely wrong but if I had to guess the turbos are pushing much less PSI so the resulting muffling affect from the turbos is decreased.

Syndicategt · 09-13-2010, 08:44 PM

My AE got noticably quieter after my tune install, I know because my wife thinks I removed the exhaust and was happy. Also, my friend's Bastuck was also quieter with his tune.

However, sound came back once I got the DP's installed, AE + AR sounds soo soo good

Jonny550 · 09-13-2010, 08:47 PM

i wasnt a believer until i took my tune out and the exhaust droned alot more, But it didnt get louder during WOT.

balance · 09-13-2010, 09:01 PM

yup. way louder without a tune.

Robmaster · 09-14-2010, 01:23 AM

i have also the BMW PE and i dont notice any change in sound/loudness after i install my JB3.

wonsungnabi · 09-14-2010, 10:22 AM

I also didn't realize it when installed. I realized it when i took it out.

now i think I should either get a set of dp or take the tune out for sound. um....... lol

joec500 · 09-14-2010, 10:33 AM

In stock form, the wastegates are open to combat rattling wastegates. This could be attributed to increased noise. As according to my understanding, tunes keep the wastegates closed at idle to increase boost response.

TwnTrboCAT1212 · 09-14-2010, 10:54 AM

I'm running Turner Exhaust with GIAC S1...Def. got noticeably louder after the flash..Not annoyingly loud, but much more aggressive, somehow..

pentaxis · 09-14-2010, 12:07 PM

Newer releases of DME software updates have a pre-emptive change to wastegate function to prevent actuator arm rattle. Essentially, the new software keeps the wastegates wide open at lower rpm. This is why the exhaust sounds louder. It does not get muffled by the blades of the turbine.

When you install a tune, this changes as the tune takes over wastegate control and improves it to an even better state than the old BMW software for better response.

Depending on the build date of your car, there is a retrofit to restore original wastegate function as well.

09-13-2010, 04:01 PM	#1
wonsungnabi First Lieutenant 20 Rep 355 Posts Drives: E92 335 Join Date: Dec 2007 Location: Boston MA iTrader: (7)	Exhaust louder without tune? I have BMW PE. I set it to stock map before service and the exhaust was noticeably louder at low rpm. Can anyone explain this please?
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09-13-2010, 05:50 PM	#2
NiVeDh Major General 422 Rep 8,003 Posts Drives: '08 E90 335i, '99 E36 M3 Join Date: Apr 2009 Location: Houston, TX & Atlanta, GA iTrader: (132) Garage List 2008 BMW 335i Sedan [8.66]	Something to do with tunes and how they go about controlling the wastegates.
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09-13-2010, 06:01 PM	#3
scrufy Zoom Zoom This 12 Rep 694 Posts Drives: The Short Bus Join Date: Jul 2010 Location: So. Cal. iTrader: (0)	I'll have to try this one out- I have the PE exhaust too. I'll set it to map zero on my jb3 after work. interesting.
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09-13-2010, 07:29 PM	#4
new2the3 Colonel 382 Rep 2,067 Posts Drives: 2020 X3M Competition Join Date: Jun 2006 Location: San Diego iTrader: (0)	I could be completely wrong but if I had to guess the turbos are pushing much less PSI so the resulting muffling affect from the turbos is decreased. __________________ 2020 X3MC 2009 135i: AW/CR Aluminum Trim, 6 speed, M-Sport, Premium, Heated Seats, Ipod, BMW Performance Pedals, BMW Performance SSK, BMW Performance Exhaust, BMW Performance Grills E93 M3 FSB
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09-13-2010, 08:44 PM	#5
Syndicategt Brigadier General 156 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	My AE got noticably quieter after my tune install, I know because my wife thinks I removed the exhaust and was happy. Also, my friend's Bastuck was also quieter with his tune. However, sound came back once I got the DP's installed, AE + AR sounds soo soo good __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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09-13-2010, 08:47 PM	#6
Jonny550 Brigadier General 241 Rep 4,936 Posts Drives: 2012 550i Xdrive Join Date: Feb 2009 Location: Jersey Shore iTrader: (14)	i wasnt a believer until i took my tune out and the exhaust droned alot more, But it didnt get louder during WOT. __________________ [SIGPIC][/SIGPIC] .
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09-13-2010, 09:01 PM	#7
balance Colonel 122 Rep 2,090 Posts Drives: F32 435i Join Date: Nov 2008 Location: OC iTrader: (6) Garage List 2014 BMW [0.00]	yup. way louder without a tune. __________________
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09-14-2010, 01:23 AM	#8
Robmaster Colonel 151 Rep 2,757 Posts Drives: 2010 E82 135, 2005 E87 130i Join Date: Apr 2007 Location: Switzerland iTrader: (3)	i have also the BMW PE and i dont notice any change in sound/loudness after i install my JB3.
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09-14-2010, 10:22 AM	#9
wonsungnabi First Lieutenant 20 Rep 355 Posts Drives: E92 335 Join Date: Dec 2007 Location: Boston MA iTrader: (7)	I also didn't realize it when installed. I realized it when i took it out. now i think I should either get a set of dp or take the tune out for sound. um....... lol
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09-14-2010, 10:33 AM	#10
joec500 Brigadier General 125 Rep 3,004 Posts Drives: it has 4 wheels Join Date: Jul 2008 Location: San Francisco iTrader: (10)	In stock form, the wastegates are open to combat rattling wastegates. This could be attributed to increased noise. As according to my understanding, tunes keep the wastegates closed at idle to increase boost response.
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09-14-2010, 10:54 AM	#11
TwnTrboCAT1212 The Moose Whisperer 22 Rep 406 Posts Drives: '08 E92 GIAC S1 335xi 6-MT Join Date: Oct 2008 Location: Massachusetts iTrader: (2)	I'm running Turner Exhaust with GIAC S1...Def. got noticeably louder after the flash..Not annoyingly loud, but much more aggressive, somehow..
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09-14-2010, 12:07 PM	#12
pentaxis Captain 30 Rep 685 Posts Drives: Space Grey E92 335i Join Date: Feb 2010 Location: Portland, OR iTrader: (3)	Newer releases of DME software updates have a pre-emptive change to wastegate function to prevent actuator arm rattle. Essentially, the new software keeps the wastegates wide open at lower rpm. This is why the exhaust sounds louder. It does not get muffled by the blades of the turbine. When you install a tune, this changes as the tune takes over wastegate control and improves it to an even better state than the old BMW software for better response. Depending on the build date of your car, there is a retrofit to restore original wastegate function as well.
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